Is Now Part of To learn more about ON Semiconductor, please visit our website at www.onsemi.com Please note: As part of the Fairchild Semiconductor integration, some of the Fairchild orderable part numbers will need to change in order to meet ON Semiconductor's system requirements. Since the ON Semiconductor product management systems do not have the ability to manage part nomenclature that utilizes an underscore (_), the underscore (_) in the Fairchild part numbers will be changed to a dash (-). This document may contain device numbers with an underscore (_). Please check the ON Semiconductor website to verify the updated device numbers. The most current and up-to-date ordering information can be found at www.onsemi.com. Please email any questions regarding the system integration to Fairchild_questions@onsemi.com. ON Semiconductor and the ON Semiconductor logo are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. "Typical" parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. www.fairchildsemi.com TL431/TL431A Programmable Shunt Regulator Features Description * * * * The TL431/TL431A are three-terminal adjustable regulator series with a guaranteed thermal stability over applicable temperature ranges. The output voltage may be set to any value between VREF (approximately 2.5 volts) and 36 volts with two external resistors These devices have a typical dynamic output impedance of 0.2. Active output circuitry provides a very sharp turn-on characteristic, making these devices excel lent replacement for zener diodes in many applications. Programmable Output Voltage to 36 Volts Low Dynamic Output Impedance 0.2 Typical Sink Current Capability of 1.0 to 100mA Equivalent Full-Range Temperature Coefficient of 50ppm/C Typical * Temperature Compensated For Operation Over Full Rated Operating Temperature Range * Low Output Noise Voltage * Fast Turn-on Response TO-92 1 1. Ref 2. Anode 3. Cathode 8-DIP 1 1.Cathode 2.3.4.5.7.NC 6.Anode 8.Ref 8-SOP 1 1. Cathode 2. 3. 6. 7. Anode 8. Ref 4. 5. NC Rev. 1.0.4 (c)2011 Fairchild Semiconductor Corporation TL431/TL431A Internal Block Diagram + - Absolute Maximum Ratings (Operating temperature range applies unless otherwise specified.) Parameter Symbol Value Unit Cathode Voltage VKA 37 V Cathode Current Range (Continuous) IKA -100 ~ +150 mA IREF -0.05 ~ +10 mA PD 770 1000 mW mW TOPR -25 ~ +85 C TJ 150 C TSTG -65 ~ +150 C Reference Input Current Range Power Dissipation D, LP Suffix Package P Suffix Package Operating Temperature Range Junction Temperature Storage Temperature Range Recommended Operating Conditions Parameter 2 Symbol Min Typ Max Unit Cathode Voltage VKA VREF - 36 V Cathode Current IKA 1.0 - 100 mA TL431/TL431A Electrical Characteristics (TA = +25C, unless otherwise specified) Parameter Reference Input Voltage Symbol Conditions TL431 Min. TL431A Typ. Max. Min. Typ. Max. 2.440 2.495 2.550 2.470 2.495 2.520 Unit VREF VKA=VREF, IKA=10mA Deviation of Reference Input Voltage OverTemperature (Note 1) V VREF/ T VKA=VREF, IKA=10mA TMINTATMAX - 4.5 17 - 4.5 17 Ratio of Change in Reference Input Voltage to the Change in Cathode Voltage VREF/ VKA IKA =10mA VKA=10VVREF - - 1.0 -2.7 - -1.0 -2.7 VKA=36V10V - -0.5 -2.0 - -0.5 -2.0 Reference Input Current IREF IKA=10mA, R1=10K,R2= - 1.5 4 - 1.5 4 A Deviation of Reference Input Current Over Full Temperature Range IREF/T IKA=10mA, R1=10K,R2= TA =Full Range - 0.4 1.2 - 0.4 1.2 A Minimum Cathode Current for Regulation IKA(MIN) VKA=VREF - 0.45 1.0 - 0.45 1.0 mA Off - Stage Cathode Current IKA(OFF) VKA=36V, VREF=0 - 0.05 1.0 - 0.05 1.0 A Dynamic Impedance (Note 2) ZKA VKA=VREF, IKA=1 to 100mA f 1.0KHz - 0.15 0.5 - 0.15 0.5 mV mV/V * TMIN= -25 C, TMAX= +85 C 3 TL431/TL431A Test Circuits TL431/A Figure 1. Test Circuit for VKA=VREF TL431/A Figure 3. Test Circuit for lKA(OFF) 4 TL431/A Figure 2. Test Circuit for VKAVREF TL431/TL431A Typical Perfomance Characteristics Figure 1. Cathode Current vs. Cathode Voltage Figure 2. Cathode Current vs. Cathode Voltage Figure 3. Change In Reference Input Voltage vs. Cathode Voltage Figure 4. Dynamic Impedance Frequency Figure 5. Small Signal Voltage Amplification vs. Frequency Figure 6. Pulse Response 5 TL431/TL431A Typical Application R1 V O = V ref 1 + ------- R2 R1 V O = 1 + ------- V ref R2 R1 V O = 1 + ------- V ref R2 MC7805/LM7805 TL431/A TL431/A TL431/A Figure 10. Shunt Regulator Figure 11. Output Control for ThreeTermianl Fixed Regulator TL431/A Figure 13. Current Limit or Current Source 6 Figure 12. High Current Shunt Regulator TL431/A Figure 14. Constant-Current Sink TL431/TL431A Mechanical Dimensions Package TO-92 +0.25 4.58 0.20 4.58 -0.15 14.47 0.40 0.46 0.10 1.27TYP [1.27 0.20] 1.27TYP [1.27 0.20] +0.10 0.38 -0.05 (0.25) +0.10 0.38 -0.05 1.02 0.10 3.86MAX 3.60 0.20 (R2.29) 7 TL431/TL431A Mechanical Dimensions (Continued) Package #5 1.524 0.10 0.060 0.004 #4 0.018 0.004 #8 2.54 0.100 9.60 MAX 0.378 #1 9.20 0.20 0.362 0.008 ( 6.40 0.20 0.252 0.008 0.46 0.10 0.79 ) 0.031 8-DIP 5.08 MAX 0.200 7.62 0.300 3.40 0.20 0.134 0.008 +0.10 0.25 -0.05 +0.004 0~15 8 0.010 -0.002 3.30 0.30 0.130 0.012 0.33 MIN 0.013 TL431/TL431A Mechanical Dimensions (Continued) Package 8-SOP MIN #5 6.00 0.30 0.236 0.012 8 0~ +0.10 0.15 -0.05 +0.004 0.006 -0.002 MAX0.10 MAX0.004 1.80 MAX 0.071 3.95 0.20 0.156 0.008 5.72 0.225 0.41 0.10 0.016 0.004 #4 1.27 0.050 #8 5.13 MAX 0.202 #1 4.92 0.20 0.194 0.008 ( 0.56 ) 0.022 1.55 0.20 0.061 0.008 0.1~0.25 0.004~0.001 0.50 0.20 0.020 0.008 9 TL431/TL431A Ordering Information Product Number TL431ACLP TL431ACD Output Voltage Tolerance 1% TL431CLP TL431CP Package TO-92 8-SOP TO-92 2% TL431CD Operating Temperature -25 ~ + 85oC 8-DIP 8-SOP DISCLAIMER FAIRCHILD SEMICONDUCTOR RESERVES THE RIGHT TO MAKE CHANGES WITHOUT FURTHER NOTICE TO ANY PRODUCTS HEREIN TO IMPROVE RELIABILITY, FUNCTION OR DESIGN. FAIRCHILD DOES NOT ASSUME ANY LIABILITY ARISING OUT OF THE APPLICATION OR USE OF ANY PRODUCT OR CIRCUIT DESCRIBED HEREIN; NEITHER DOES IT CONVEY ANY LICENSE UNDER ITS PATENT RIGHTS, NOR THE RIGHTS OF OTHERS. LIFE SUPPORT POLICY FAIRCHILD'S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD SEMICONDUCTOR CORPORATION. As used herein: 1. Life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. A critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com 2/22/11 0.0m 001 Stock#DS400301 (c) 2011 Fairchild Semiconductor Corporation ON Semiconductor and are trademarks of Semiconductor Components Industries, LLC dba ON Semiconductor or its subsidiaries in the United States and/or other countries. ON Semiconductor owns the rights to a number of patents, trademarks, copyrights, trade secrets, and other intellectual property. A listing of ON Semiconductor's product/patent coverage may be accessed at www.onsemi.com/site/pdf/Patent-Marking.pdf. ON Semiconductor reserves the right to make changes without further notice to any products herein. ON Semiconductor makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does ON Semiconductor assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. Buyer is responsible for its products and applications using ON Semiconductor products, including compliance with all laws, regulations and safety requirements or standards, regardless of any support or applications information provided by ON Semiconductor. "Typical" parameters which may be provided in ON Semiconductor data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including "Typicals" must be validated for each customer application by customer's technical experts. ON Semiconductor does not convey any license under its patent rights nor the rights of others. ON Semiconductor products are not designed, intended, or authorized for use as a critical component in life support systems or any FDA Class 3 medical devices or medical devices with a same or similar classification in a foreign jurisdiction or any devices intended for implantation in the human body. Should Buyer purchase or use ON Semiconductor products for any such unintended or unauthorized application, Buyer shall indemnify and hold ON Semiconductor and its officers, employees, subsidiaries, affiliates, and distributors harmless against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death associated with such unintended or unauthorized use, even if such claim alleges that ON Semiconductor was negligent regarding the design or manufacture of the part. ON Semiconductor is an Equal Opportunity/Affirmative Action Employer. This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor 19521 E. 32nd Pkwy, Aurora, Colorado 80011 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: orderlit@onsemi.com (c) Semiconductor Components Industries, LLC N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center Phone: 81-3-5817-1050 www.onsemi.com 1 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative www.onsemi.com